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authortv <tv@krebsco.de>2019-01-23 00:02:42 +0100
committertv <tv@krebsco.de>2019-01-23 00:57:36 +0100
commitd40815fd56bf1895af89b72b1171675a2e0ae5f7 (patch)
tree83b96a701f16b13915836c3a6c94463732a9f6d8 /src/Control/Concurrent
parenta00da57346c195b1b15d1c6aca2891483901aae6 (diff)
src: use more simple functions
Diffstat (limited to 'src/Control/Concurrent')
-rw-r--r--src/Control/Concurrent/Extended.hs24
1 files changed, 24 insertions, 0 deletions
diff --git a/src/Control/Concurrent/Extended.hs b/src/Control/Concurrent/Extended.hs
new file mode 100644
index 0000000..933e3a6
--- /dev/null
+++ b/src/Control/Concurrent/Extended.hs
@@ -0,0 +1,24 @@
+module Control.Concurrent.Extended
+ ( module Exports
+ , newChan
+ , newRef
+ , newRelay
+ , newSemaphore
+ ) where
+
+import Control.Arrow
+import Control.Concurrent as Exports hiding (newChan,readChan,writeChan)
+import qualified Control.Concurrent.Chan.Unagi as U
+import Data.IORef
+
+newChan :: IO (a -> IO (), IO a)
+newChan = (U.writeChan *** U.readChan) <$> U.newChan
+
+newRef :: a -> IO (a -> IO (), IO a)
+newRef v0 = (atomicWriteIORef &&& readIORef) <$> newIORef v0
+
+newRelay :: IO (a -> IO (), IO a)
+newRelay = (putMVar &&& takeMVar) <$> newEmptyMVar
+
+newSemaphore :: IO (IO (), IO ())
+newSemaphore = first ($()) <$> newRelay